Profiles of Sugar and Organic Acid of Fruit Juices: A Comparative Study and Implication for Authentication

Table 1

Sugar profiles of different fruit juices.

Juice	Apple (n = 12)	Pear (n = 15)	Peach (n = 12)	Grape (n = 17)	Sweet cherry (n = 14)	Strawberry (n = 10)	Blueberry (n = 5)
Sucrose (g/L)	25.56 ± 8.42^b	33.66 ± 21.35^b	73.22 ± 18.03^a	0.55 ± 0.72^d	—	13.38 ± 7.56^c	0.42 ± 0.23^d
Glucose (g/L)	24.27 ± 4.48^d	17.79 ± 5.64^e	11.77 ± 3.44^f	90.59 ± 8.61^a	63.78 ± 10.72^b	20.02 ± 2.38^de	56.21 ± 5.14^c
Fructose (g/L)	70.32 ± 8.65^b	40.12 ± 10.95^e	13.06 ± 4.16^g	95.38 ± 10.28^a	51.23 ± 10.67^d	23.48 ± 2.82^f	59.90 ± 6.17^c
Sorbitol (g/L)	3.55 ± 1.56^c	30.26 ± 10.00^a	3.13 ± 2.93^c	—	16.15 ± 4.72^b	—	—
Total (g/L)	123.70 ± 15.41^b	121.83 ± 14.81^b	101.18 ± 24.03^c	186.52 ± 17.77^a	131.17 ± 25.32^b	56.88 ± 10.70^d	116.53 ± 11.25^bc
Fru/Glu	2.99 ± 0.60^a	2.40 ± 0.74^b	1.10 ± 0.05^c	1.05 ± 0.07^c	0.80 ± 0.05^c	1.17 ± 0.02^c	1.06 ± 0.02^c
Sucrose/total (%)	20.31 ± 5.38^b	27.39 ± 16.26^b	72.51 ± 5.06^a	0.30 ± 0.42^c	—	22.41 ± 8.53^b	0.37 ± 0.21^c
Glucose/total (%)	19.90 ± 4.82^c	14.74 ± 4.50^d	11.76 ± 2.35^e	48.61 ± 1.75^a	48.86 ± 1.66^a	35.70 ± 3.79^b	48.26 ± 0.29^a
Fructose/total (%)	56.93 ± 3.18^a	33.14 ± 8.73^d	13.04 ± 2.96^e	51.09 ± 1.70^b	38.99 ± 1.66^c	41.89 ± 4.74^c	51.38 ± 0.46^b
Sorbitol/total (%)	2.86 ± 1.25^c	24.74 ± 7.18^a	2.68 ± 2.31^c	—	12.15 ± 1.72^b	—	—

Different letters for each species of fruit juice indicate the significant differences at ; —: not detected.